diff --git a/Dockerfile b/Dockerfile
index 60136b5..f8881c0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:latest@sha256:d35dfc2fe3ef66bcc085ca00d3152b482e6cafb23cdda1864154caf3b19094ba
 ENV  TZ="Europe/Amdsterdam"
 
 RUN  useradd -ms /bin/bash user